BTH处理对不同生育期甜瓜抗白粉病的诱导效应

以幼苗期、伸蔓期和幼果期的黄河蜜甜瓜为试材,研究了苯并噻二唑(BTH)处理对3个生育期甜瓜植株抗白粉病的诱导效应。结果显示:0.25mmol·mL-1BTH对幼苗期和伸蔓期甜瓜植株的诱导效果显著高于幼果期甜瓜植株,而伸蔓期和幼苗期植株之间病情指数差异不显著;0.25mmol·mL-1BTH处理后,幼苗期甜瓜植株叶片中β-1,3-葡聚糖酶(GLU)活性在接种白粉菌后增幅最大,伸蔓期次之,幼果期最小;无论是诱导+接种的植株,还是只接种的植株,叶片中的苯丙氨酸解氨酶(PAL)活性高峰都随着苗龄增大呈现出不断推迟的现象。

Inducing Effects of BTH Treatment on Melon Resistance to Powdery Mildew at Different Growing Stages

Inducing effects of BTH spaying on resistance to powdery mildew（Erysiphe cucurbitacearum）at 3 stages of melon（Cucumis melo L.）plants were studied, taking melons of seedling, tendril and young fruit stages as experiment materials. The results showed that 0.25 mmol&;#8226;mL-1 BTH had significanty higher inducing effect on melons at seedling and tendril stages than at the young fruit stage. But inducing effects are not significantly different between melon in tendril and seedling stages. After 0.25 mmol&;#8226;mL-1 BTH treatment, the amplification of GLU activity in melon leaf-blades at seedling stage is the largest, the next is at tendril stage and the lowest is at young fruit stage. The climax of PAL activity in leaf-blades is postponed along with the increase of plant ages, no matter it is an induced+inoculation plant or a pure inoculation plant.